Minnesota Building Codes, Permits and Contractor Rules
Here’s every rule from our 50-state guides for Minnesota on one page: the residential building code, frost depth, retaining wall permits, the 811 dig law, drainage law, contractor licensing, deposit limits, mechanics lien deadlines, workers’ comp, planting zones and frost dates. Each section links the official source and the full 50-state comparison.
Minnesota at a glance
- Building code: 2018 IRC (statewide)
- Frost depth: 60 in. Zone I (north); 42 in. Zone II (south)
- 811 notice: At least 48 hours (excluding the day of notice, weekends and holidays) and not more than 14 calendar days before excavation
- Contractors: State license required
- Deposits: No statewide cap
- Liens: 120 days from last furnishing
- Workers’ comp: 1+ employees
- Drainage rule: Reasonable use
- Planting zones: 3a to 5a
| Topic | Minnesota | Compare |
|---|---|---|
| Residential building code | 2018 IRC (statewide) | All states |
| Frost line depth | 60 in. Zone I (north); 42 in. Zone II (south) | All states |
| Retaining wall permit | Exempt if not over 4 ft (1,219 mm) measured from the bottom of the footing to the top of the wall, unless supporting a surcharge or impounding Class I, II or… | All states |
| 811 notice before digging | At least 48 hours (excluding the day of notice, weekends and holidays) and not more than 14 calendar days before excavation | All states |
| Contractor license | State license required | All states |
| Deposit limit | No statewide cap | All states |
| Right to cancel | 3 business days, sales made at home | All states |
| Lien filing deadline | 120 days from last furnishing | All states |
| Workers’ comp required | 1+ employees | All states |
| Drainage between neighbors | Reasonable use | All states |
| Planting zones (2023 USDA) | 3a to 5a | All states |
| Frost dates (NOAA) | Last frost late Apr (Minneapolis-St. Paul) to late May (International Falls); first frost mid-Sep (International Falls) to mid-Oct (Minneapolis-St. Paul) | All states |
Minnesota residential building code
- Code
- 2020 Minnesota Residential Code (2018 International Residential Code with Minnesota amendments, Minn. R. ch. 1309), part of the Minnesota State Building Code
- How it applies
- Statewide, mandatory everywhere
- In effect since
- March 31, 2020
- Code agency
- Minnesota Department of Labor and Industry, Construction Codes and Licensing Division
- Who enforces it
- The State Building Code is the legal minimum everywhere in Minnesota, but cities and counties can only enforce it after adopting it by ordinance, so areas that haven't adopted it may have no permits or inspections.
- Good to know
- Minnesota's code is the legal minimum everywhere, but it's only inspected where a city or county has adopted it. The state has started work on moving to the 2024 IRC.
Compare building codes in all 50 states
Frost line depth in Minnesota
- Who sets it
- County table in state code
- Statewide value
- 60 in. Zone I (north); 42 in. Zone II (south)
- Good to know
- Minn. R. 1303.1600 puts each county in a zone, for example St. Louis, Clay and Beltrami in Zone I and Hennepin, Ramsey and Olmsted in Zone II. An engineer competent in soil mechanics can justify a shallower depth.
Frost line depth in every state
Retaining wall permits in Minnesota
- Permit exemption
- Exempt if not over 4 ft (1,219 mm) measured from the bottom of the footing to the top of the wall, unless supporting a surcharge or impounding Class I, II or III-A liquids (Minn. R. 1300.0120, subp. 4.A.4).
- Who decides
- Your city or county building official administers the code and decides.
- Good to know
- Height is measured from the bottom of the footing to the top of the wall. Walls that support a surcharge aren't exempt.
Retaining wall permit rules in every state
811 dig law in Minnesota
- One-call center
- Gopher State One Call
- Notice before digging
- At least 48 hours (excluding the day of notice, weekends and holidays) and not more than 14 calendar days before excavation
- Ticket good for
- 14 calendar days from the start time on the notice (6 months if the excavator arranges periodic re-marking with operators)
- Hand-dig zone
- 2 ft (24 in.) on either side of the facility; excavator must find the precise location before digging within 2 ft of the marks
- Homeowners
- By statute, 'excavation' means disturbing soil with a motor, engine, hydraulic or pneumatically powered tool, so shovel digging is outside it; gardening is excluded unless 12 in. or deeper, and agriculture/windbreak planting unless 18 in. or deeper. Gopher State One Call says homeowners are responsible for notifying it and recommends calling even for a shovel-and-rake garden.
- The law
- Minn. Stat. ch. 216D; Minn. R. ch. 7560
- Good to know
- The law covers only powered tools, but Gopher State One Call recommends calling even for a shovel-and-rake garden.
Drainage law and stormwater permits in Minnesota
- Rule
- Reasonable use
- The rule
- Reasonable use: a landowner is liable only when a harmful interference with the flow of surface water is unreasonable, weighing the extent of harm, its foreseeability and the landowner's purpose.
- Leading case
- Pell v. Nelson. 201 N.W.2d 136 (Minn. 1972); following Enderson v. Kelehan, 226 Minn. 163, 32 N.W.2d 286 (1948)
- What it means for your yard
- You can drain and improve your lot, but if your regrading, downspouts or patio unreasonably send water onto a neighbor, judged by how much harm it does, whether it was foreseeable and why you did it, you can be liable.
- Construction stormwater permit
- Minnesota Pollution Control Agency (MPCA): 1 acre or more of soil disturbance, or less than 1 acre if part of a common plan of development or sale covering more than 1 acre
- State rules below 1 acre
- Any amount of soil disturbance can require permit coverage if MPCA determines the activity poses a risk to water resources
- Local rules
- Minnesota cities, counties and watershed districts often have their own grading, erosion control and stormwater rules for small projects.
- Good to know
- Minnesota judges drainage disputes by whether the interference with water flow was reasonable. State construction stormwater permits start at 1 acre, and watershed districts often regulate smaller jobs.
Contractor licensing in Minnesota
- Statewide rule
- License
- Agency
- Minnesota Department of Labor and Industry (DLI)
- Who needs it
- Residential building contractors and remodelers must be licensed unless annual gross receipts are under $15,000 (those need a yearly Certificate of Exemption); residential roofers need a license.
- When it applies
- Contractors with $15,000 or more in annual gross receipts
- Check a contractor
- Official lookup
- Good to know
- A remodeler license covers existing homes only; a residential building contractor license also covers new construction.
Contractor license requirements in every state
Contractor deposits and your right to cancel in Minnesota
- Deposit limit
- No statewide cap.
- Right to cancel
- Home solicitation sales over $25 of goods, services or improvements to real property, made away from the seller's place of business: 3 business days to cancel (Saturdays, Sundays and holidays don't count) (Minn. Stat. §§ 325G.06, 325G.07). Buyer-requested repair visits and signed emergency waivers are excluded.
- Written contract
- All agreements between a licensed residential contractor and a customer must be in writing, signed and dated, with a detailed summary of services, the materials or standard features, and the total price or how it is calculated; the customer gets written performance guidelines before signing (Minn. Stat. § 326B.809).
- Other protections
- Contractor Recovery Fund can compensate owners of 1–4 family homes for out-of-pocket losses from fraud, deceptive practices, conversion of funds or failure to perform by a licensed residential contractor, after the owner obtains a final court judgment against the licensee; payments are capped at $100,000 per owner per licensee and $550,000 in total per licensee (Minn. Stat. § 326B.89, subds. 5–6).
- The law
- Minn. Stat. § 326B.809; §§ 325G.06–325G.11 (home solicitation sales); § 326B.89 (recovery fund)
- Good to know
- Minnesota's Contractor Recovery Fund can reimburse homeowners up to $100,000 when a licensed residential contractor takes the money and doesn't do the work, but you first need a court judgment against the contractor.
Contractor deposit limits in every state
Mechanics lien deadlines in Minnesota
- Lien deadline (prime)
- Record the lien statement and serve the owner within 120 days after the last work or last item furnished (Minn. Stat. § 514.08).
- Lien deadline (sub/supplier)
- Same as prime.
- Preliminary notice (sub/supplier)
- Required. Written notice to the owner, personally or by certified mail, within 45 days after first furnishing. A good-faith effort to comply saves the lien unless someone proves damage (Minn. Stat. § 514.011, subd. 2).
- Notice of intent
- Not required.
- Enforce within
- Complaint or answer within 1 year after the date of the last item in the recorded lien statement, with a notice of lis pendens (Minn. Stat. § 514.12).
- Homeowner rules
- The required notices tell owners they may pay subs and suppliers directly or withhold from the contractor until 120 days after completion unless they receive signed lien waivers (Minn. Stat. § 514.011).
- The law
- Minn. Stat. Ch. 514 (Liens; Labor, Material), §§ 514.01-514.17
- Good to know
- Minnesota contractors who use subs or suppliers lose lien rights if the state's prelien notice isn't in the homeowner contract (or delivered within 10 days if there's no written contract), and subs must notify the owner within 45 days of starting.
Mechanics lien deadlines in every state
Workers' comp requirements in Minnesota
- Who must carry it
- Every employer must cover its employees unless a statutory exclusion applies or it is approved to self-insure; there is no minimum number (Minn. Stat. §§ 176.021, 176.181; Minnesota DLI). No separate construction threshold.
- Owners and officers
- Excluded: sole proprietors and their immediate family; partners and their spouses, parents and children; executive officers of closely held corporations (10 or fewer shareholders) owning at least 25% of stock, and managers of LLCs (10 or fewer members) owning at least 25%, if the business had under 22,880 payroll hours the prior year, plus their immediate family (Minn. Stat. § 176.041; DLI info sheet).
- Subcontractors
- If a subcontractor fails to comply with the comp law, the general contractor, intermediate contractor or subcontractor above it is liable for all compensation due to the sub's employees working on the contract (Minn. Stat. § 176.215, subd. 1).
- Homeowners
- Domestic, repair, groundskeeping or maintenance workers at a private household are excluded if they earn less than $1,000 cash in a three-month period (unless they earned more than $1,000 in a quarter at that household in the prior year) (Minn. Stat. § 176.041; DLI info sheet).
- Penalties
- DLI can fine uninsured employers up to $1,000 per employee per week of noncompliance and order them not to employ anyone until insured; corporate owners or officers who direct employees count as the employer; willful noncompliance is a gross misdemeanor; if a worker is hurt, the employer owes the benefits plus a penalty of 65% of those benefits (Minn. Stat. §§ 176.181 subds. 3-4, 176.183 subd. 2).
- The law
- Minn. Stat. Ch. 176; §§ 176.041, 176.181, 176.183, 176.215
- State agency
- Minnesota Department of Labor and Industry (DLI)
- Good to know
- Minnesota has no minimum employee count. A general contractor can be liable for an uninsured sub's injured worker, and uninsured employers face fines up to $1,000 per employee per week.
Workers' comp requirements in every state
Planting zones in Minnesota
- 2023 USDA zones
- 3a to 5a
- Coldest-night range
- −40°F to −15°F
- Coldest area
- Small pockets around Tower and Embarrass and the northern edge of Koochiching County
- Warmest area
- Much of southern Minnesota and the Twin Cities metro
- Example cities
- Minneapolis: 5a, Duluth: 5a, Rochester: 4b, International Falls: 3b
- Local plant advice
- University of Minnesota Extension
- Good to know
- The Twin Cities moved from 4b to 5a on the 2023 map. The coldest zone, 3a, has shrunk to small pockets around Tower and Embarrass and along the northern edge of Koochiching County.
Frost dates in Minnesota
| Station | Last spring frost | First fall frost | Frost-free days |
|---|---|---|---|
| Minneapolis-St. Paul Twin Cities | April 23 | October 18 | 176 |
| Rochester Southeast Minnesota | April 30 | October 6 | 159 |
| Duluth Lake Superior / Arrowhead | May 13 | October 1 | 140 |
| International Falls Northern border | May 29 | September 13 | 109 |
- Typical range
- Last frost late Apr (Minneapolis-St. Paul) to late May (International Falls); first frost mid-Sep (International Falls) to mid-Oct (Minneapolis-St. Paul)
- Good to know
- These are typical (50%) dates from NOAA's 1991–2020 climate normals, so about half of years still bring a 32°F night after the listed spring date. In Minnesota, the last spring frost at the stations listed ranges from late April around Minneapolis-St. Paul to late May around International Falls. University of Minnesota Extension describes the average last frost as early May in the south to late May or early June up north, a bit later than NOAA's Twin Cities date (April 23).
- Local frost or planting guide
- University of Minnesota Extension
Frequently Asked Questions
What building code does Minnesota use?
2020 Minnesota Residential Code (2018 International Residential Code with Minnesota amendments, Minn. R. ch. 1309), part of the Minnesota State Building Code. It applies as follows: statewide, mandatory everywhere. Your local building department can confirm the edition and amendments for your address.
How deep is the frost line in Minnesota?
The state sets 60 in. Zone I (north); 42 in. Zone II (south). Footings for houses, additions and attached decks go below it.
How much can a contractor ask for up front in Minnesota?
No statewide cap. Cancel rights: Home solicitation sales over $25 of goods, services or improvements to real property, made away from the seller’s place of business: 3 business days to cancel (Saturdays, Sundays and holidays don’t count) (Minn. Stat. §§ 325G.06, 325G.07). Buyer-requested repair visits and signed emergency waivers are excluded.
How long does a contractor have to file a mechanics lien in Minnesota?
Record the lien statement and serve the owner within 120 days after the last work or last item furnished (Minn. Stat. § 514.08). Subcontractors and suppliers may have different notice rules; see the section above.
What planting zone is Minnesota?
On the 2023 USDA map, Minnesota runs from zone 3a to 5a. Examples: Minneapolis 5a, Duluth 5a, Rochester 4b. Enter your ZIP on the USDA map for your exact zone.
Do contractors need workers' comp in Minnesota?
Every employer must cover its employees unless a statutory exclusion applies or it is approved to self-insure; there is no minimum number (Minn. Stat. §§ 176.021, 176.181; Minnesota DLI). No separate construction threshold. Owner exemptions and subcontractor rules are in the workers’ comp section above.
When is the last frost in Minnesota?
At the NOAA stations we list: Last frost late Apr (Minneapolis-St. Paul) to late May (International Falls); first frost mid-Sep (International Falls) to mid-Oct (Minneapolis-St. Paul). These are typical (50%) dates from the 1991–2020 climate normals, so about half of years still bring a 32°F night after the spring date.
This page is general information, not legal or tax advice. Rules change; the agencies and statutes linked above have the final word.
Minnesota in each 50-state guide: Frost line depth · 811 dig laws · Retaining wall permits · Contractor licensing · Contractor deposit limits · Building codes · Planting zones · Mechanics lien deadlines · Workers' comp · Frost dates · Drainage laws · Noxious weed laws · Rainfall and snowfall · Landscaper pay · Pesticide applicator licensing · Landscaping sales tax · All state guides
Last checked October 31 and November 1, 2026 against official state and local sources for this state. Rules change; your state agency or local building department has the final word. Spot something out of date? Email info@muthlerlandscaping.com and we’ll fix it.
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Cite as: Muthler Landscaping & Construction, “Minnesota Building Codes, Permits and Contractor Rules,” https://muthlerlandscaping.com/state-guides/minnesota/ (last checked November 9, 2026).
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